I am a prime number.
The double of myself is equal to the square of me.

which number am I?

When it's bad luck to meet a black cat?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

I have branches, but no fruit, trunk or leaves. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?